WESTLAKE CORP — Director's Dealing 2018

Feb 23, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2018-02-22

Reporting Person: Ederington L. Benjamin (SVP, GC, CAO and Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-22	Common Stock	M	1066	$63.9775	Acquired	13111	Direct
2018-02-22	Common Stock	M	5876	$68.09	Acquired	18987	Direct
2018-02-22	Common Stock	S	6942	$111.447	Disposed	12045	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-02-22	Employee Option (right to buy)	$63.9775	M	1066	Disposed	2024-02-14	Common Stock (1066)	Direct
2018-02-22	Employee Option (right to buy)	$68.09	M	5876	Disposed	2025-02-20	Common Stock (5876)	Direct

Footnotes

F1: The stock options are excercisable in three installments of 33%, 33% and 34% on February 14, 2015, 2016 and 2017.

F2: The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2016, 2017 and 2018.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $111.36 to $111.74, inclusive. The reporting person undertakes to provide to Westlake Chemical Corp., any security holder of Westlake Chemical Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.